Holder for punches or other tools



1927' E. HENRICSON HOLDER FOR PUNCHES OR OTHER TOOLS Filed Aug. 8, 1925Patented Aug. 9, 1927. I

EDWIN HENBICSON, .OF DETROIT, MICHIGAN.

HOLDER FOR PU 'NCHES OR OTHER TOOLS.

Application filed August 8, 1925. Serial No. 49,145.

other new and useful features in the con struction and arrangement ofparts, all as hereinafter more fully described.

WVith the above and other ends in view, the invention consists in thematters hereinafter set forth and more particularly pointed out in theappended claims, reference being had to the accompanying draw ing inwhich Figure 1 is a vertical section through a device illustrative ofthe invention and showing a punch in place and in side elevation;

Fig. 2 is a transverse section substantially on the line II-II of Fig.1;

Fig. 3 is a similar section upon the line III-III of Fig. 1;

Fig. 4 is a perspective detail of an end portion of a punch or tooldetached, and

Fig. 5 is a perspective view of a bushing showing the same partly insection to more clearly disclose the construction.

In the drawing, 1 indicates the ramof the punch press or other part orholding member within which the punch or other tool is inserted. Withina suitable bore in the head or ram 1, is inserted a bushing 2 having anenlarged upper end portion 3 and which bushing is cut away at one sideor slotted, as at 4, to receive a key 5, said key being formed with asemicircular side face in plan view to fit the contour of the bore inwhich the bushing 2 is inserted, and this .key has a straight oppositeside to abut against the bottom of the slot 4 in the bushing and toproject slightly into the bore of the bushing. This key is thereforeheld in place by the insertion of the bushing in the bore of the head.

The punch or other tool 6 is formed adjacent the end portion which is tobe inserted and fit within the bushing 2, with an annular groove 7extending a portion of the way around the shafikof the tool or punch andthis groove is of substantially the same the bushing 2 near its upperend to receive a ball 10, said ball being urged into frictional contactwith the flattened side 8 of the punch shank, by a spring wire 11 intheform of a split ring, said springbeing inserted within an annularperipheral groove 12 formed in the enlarged upper'end portion 3 of thebushing 2.

The shank or upper end portion of the punch or tool 6 is inserted in thebushing 2 to be held therein, by an endwise movement of the punch withthe flattened side 8 toward the key' 5 so that the groove 7 may bebrought into alignment with the key and then by'a turning movement ofthe punch, the groove is brought opposite the key with the key in thegroove to firmly hold the punch shank within, the bushing and preventthe punch from dropping out of the mm of the press. \Vhen the punch isturned to bring'the key into the groove, it is given a substantiallyhalf rotation to bring the flattened side 8 of the'punoh shank oppositethe ball 10 so that the frictional engagement of this ball with theflattened side will prevent rotation of the punch in the bushing andthus retain it in position with its. groove engaged with the key.

To releasethe punch from the ram 1 it is only necessary to rotate thepunch against the frictional resistance of the .ball 10 engaging theflattened side of the shank ofthe punch, bringing this flattened sideopposite the key 5, when the punch may be moved endwise past the key anddisengaged from the ram. v

In this construction the entire holding means for detachably holding thepunch in place, is contained within the cross-sectional area of a simplebushing, which bushing are also held in place against dropping out,

by the insertion of the bushing within the bore of the ram, the bore 9in which the ball 10 is inserted, being formed with an inner end whichis reduced in diameter to prevent the ball from passing out of the innerend of this bore into the axial bore of the bushing when the shank ofthe punch is withdrawn. The split ring 11 is also retained in placebybeing placed within a peripheral groove in the bushing, which grooveis closed by the insertion of the bushing in the bore of the ram.

A very simple device. is thus provided for detachably holding a punch orother tool within its ram or holder and the construction of this deviceis such that by a simple turning movement of the punch, it may bereadily detached or, inserted. The bushing not only serves to carry thekey 5 and the friction device for normally holding the punch shankagainst rotation, but also serves particular construction shown.

Having thus fully described my invention, what I claim is 1. A device ofthe character described, comprising a tool carrying member providedwitha bore, a bushing adapted to fit into the axial bore of the bushing, aball within the transverse bore of the bushing, a

spring within the. annular grbove in the;

with a flattened side to pass the key in the v removal of the shank fromthe bushing.

2. A tool holder comprising a carrying member having a bore, a bushingto fit within the bore in the carrying member, said bushing being formedwith a transverse slot in one side intermediate its ends, said slotcutting through the wall of the bushing into the bore thereof,- and,also formed with a transverse bore adjacent oneend which bore extendsinwardly from the outer side of the bushing and opens into the axialbore thereof, a-key within the slot in the bushing, said key having aside curved to conform to the curve of the bore in which the bushing isinserted'and with a substantially straight opposite side to project intothe axial bore of the bushing, said key being held in place by theinsertion of the bushing within the bore of the carrying member, a toolhaving a shank portion to fit within the axial bore of the bushing andformed with a flattened side to pass by the key and with an annulargroove at the inner end of saidflattened side to receive the key whenthe shank is inserted in the bushing past the key and then turned, andmeans within the transverse bore in the bushing to engagethe tool shankand yieldingly resist turning movement of the shank withinthe bushing,the outer end of said transverse bore being closed by the insertion ofthe bushing in the bore of the carrying member.

In testimony whereof I aflix my signature." 1 EDWIN HENRICSON.

